The Cardinals' front office postponed Friday's game more than two hours before the scheduled first pitch. Instead, the teams will play a doubleheader Sunday. Tickets to Friday's game can be exchanged for any regular-season game but must be either mailed or exchanged at the Hammons Field box office, at Gate 1. Rotation intrigue

Springfield is currently carrying six starting pitchers now that prospect Carlos Martinez won't need a piggyback situation. But the organization has yet to make a decision, as a starter could be sent to the eight-man bullpen, which already is crowded. "It's very tough, especially when you're dealing with good people," minor league pitching coordinator Brent Strom said. "Everybody's working hard." New series

The Cardinals shift their focus today to the opener of a four-game series against the Arkansas Travelers, the Double-A affiliate of the Los Angeles Angels. Travs prospects

The Travelers feature third baseman Kaleb Cowart and first baseman C.J. Cron, the No. 1- and No. 3-rated Angels prospects by Baseball America, respectively. Outfielder Randal Grichuk (6) and second baseman Taylor Lindsay (8) also are among the Angels' Top 30. - Kary Booher